The CAS Registry Mumber 865539-86-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,6,5,5,3 and 9 respectively; the second part has 2 digits, 8 and 6 respectively. Calculate Digit Verification of CAS Registry Number 865539-86: (8*8)+(7*6)+(6*5)+(5*5)+(4*3)+(3*9)+(2*8)+(1*6)=222 222 % 10 = 2 So 865539-86-2 is a valid CAS Registry Number.
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